CentOS/RHEL: Updating the entire system?

[epretorious]

Is is safe to update the base system using yum/rhn or does Plesk manage this facet too?

 

[hardweb]

You can do this without any problem.

 

[epretorious]

Do I need to be concerned about packages that have been customized by sw-soft (e.g., Mailman)?

Thanks (again)!